CN106610461B - A kind of high voltage direct current equipment quick fault testing method and detection system - Google Patents
A kind of high voltage direct current equipment quick fault testing method and detection system Download PDFInfo
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Abstract
The present invention relates to a kind of high voltage direct current equipment quick fault testing method and detection systems, and the method includes the work state information of the voltage and current signal on route and measuring system is obtained by power circuit measuring system；Obtain the criterion numerical value of high voltage direct current equipment protection system；Judge that the work state information of measuring system is sent to high voltage direct current equipment protection system, and make corresponding response according to work state information if there are failures for measuring system with the presence or absence of failure by it according to work state information；If failure is not present in measuring system, compared respectively with the voltage and current signal according to criterion numerical value, judges high voltage direct current equipment with the presence or absence of failure；If there are failures for high voltage direct current equipment, fault message and physical quantity are uploaded to protection system.Technical solution of the present invention can realize the precise acquisition and signal processing in tens microseconds to fault current, meet failure response minimum time requirement under the forceful electric power magnetic environment of Current Voltage high speed transient.
Description
Technical field:
The present invention relates to field of power system, be more particularly to a kind of high voltage direct current equipment quick fault testing method and
Detection system.
Background technique:
Since the high voltage direct current equipment failure electric current rate of climb is exceedingly fast, need in a very short period of time, by quick fault testing
Device completes Signal acquiring and processing, and completes system overcurrent by Control protection system and identify and execute disjunction movement, be to it
Control & protection strategy and sequence control process are furtherd investigate, and development and design meets the fault detection dress that failure quickly accurately identifies
It sets and High-speed Control protective device.
Can accurate judgement failure be high voltage direct current equipment important indicator, by collected voltage, current signal and sentence
According to comparing, failure is judged whether there is, application No. is proposed in 201410327517 patent application through sampling electricity
Road acquires the signal of tested vacuum circuit breaker, and collected signal is compared by level shifting circuit with preset signals range,
When collected signal exceeds preset signals range, comparison result signal is issued, single-chip microcontroller judges according to comparison result signal
The fault type of tested vacuum circuit breaker, and stored, it is exactly a kind of method of breakdown judge, but this method is not special
Inaccurate, the present invention judges failure using the processing method of interval threshold, it is ensured that the accuracy of judging result.
Since the electric current rate of climb is fast when flexible DC transmission route occurs bipolar short-circuit, it is desirable that high voltage direct current equipment can
Quick acting.The breaker intelligent trouble detection method proposed in patent CN201220634850, needs time several seconds, can just sentence
Disconnected load of being out of order.
Summary of the invention:
The object of the present invention is to provide a kind of high voltage direct current equipment quick fault testing detection method and detection system, energy
Enough under the forceful electric power magnetic environment of Current Voltage high speed transient, realize at the interior precise acquisition and signal to fault current of tens microseconds
Reason, meets failure response minimum time requirement.
To achieve the above object, the invention adopts the following technical scheme: a kind of high voltage direct current equipment uses quick fault testing
Method, comprising:
Voltage signal, current signal and the power circuit measurement system on transmission line of electricity are obtained by power circuit measuring system
The work state information of system；
Obtain the criterion numerical value of high voltage direct current equipment protection system；
It is judged with the presence or absence of failure, if the power line according to the work state information of the power circuit measuring system
There are failures for road measuring system, then the work state information of the power circuit measuring system are sent to the high voltage direct current and filled
Standby protection system, and according to the work state information, make corresponding response；
If the power circuit measuring system be not present failure, according to the criterion numerical value respectively with the voltage signal
It is compared with current signal, judges high voltage direct current equipment with the presence or absence of failure；
If there are failures for high voltage direct current equipment, its fault message and Current Voltage value are uploaded to the high voltage direct current and filled
Standby Control protection system.
The power circuit measuring system according to the current signal and voltage signal that measure determine current changing rate,
Whether voltage change ratio, current over-zero, the signal of current amplitude and voltage magnitude.
The breakdown judge of high voltage direct current equipment include overcurrent judgement, over-voltage judgement, current changing rate breakdown judge and
Voltage change ratio breakdown judge.
The overcurrent deterministic process are as follows:
Current information i on monitoring transmission line of electricity in real time, and the threshold value I with high voltage direct current equipment protection systemMInto
Row compares, relatively more preceding to handle the current information i for unsigned number；
Since the current information i itself is there are a deviation delta, cause overcurrent relatively in, overcurrent flag bit will appear
Jitter phenomenon, therefore the facture of interval threshold is used to carry out overcurrent comparison:
If i >=IM, then over current fault flag bit is 1, indicates overcurrent fault；
If i < (IM-Δi), then over current fault flag bit is 0, is expressed as non-overcurrent fault；
Wherein, Δi> Δ.
The over-voltage deterministic process are as follows:
Information of voltage v on monitoring transmission line of electricity in real time, and the threshold value V with high voltage direct current equipment protection systemMInto
Row compares, relatively more preceding to handle information of voltage v for unsigned number；
If: v >=VM, then over-voltage mark failure will position is 1, indicates overvoltage failure；
If: v < (VM-Δv), then over-voltage fault flag bit is 0, indicates non-excessive voltage failure；
Wherein, Δv> voltage sample deviation.
The current changing rate breakdown judge process are as follows:
The current changing rate information di/dt that the power circuit measuring system measures, and and high voltage direct current are obtained in real time
Equip the change rate threshold value di of protection systemMIt is compared；
If di/dt >=diM, then current changing rate fault flag is 1, indicates current changing rate failure；
If di/dt < (diM-Δi-rate), then current changing rate fault flag is 0, indicates non-current changing rate failure；
Wherein, Δi-rate> current changing rate sampling deviation.
The voltage change ratio breakdown judge process are as follows:
The voltage change ratio information du/dt that the power circuit measuring system measures, and and high voltage direct current are obtained in real time
Equip the change rate threshold value du of protection systemMIt is compared；
If du/dt >=duM, then voltage change ratio fault flag is 1, indicates voltage change ratio failure；
If du/dt < (duM-Δu-rate), then voltage change ratio fault flag is 0, indicates non-voltage change ratio failure；
Wherein, Δu-rate> voltage change ratio sampling deviation.
The control cabinet includes power panel, communication board and master control borad；
The communication board obtains voltage signal, current signal and electric power on transmission line of electricity by power circuit measuring system
The work state information of route survey system；By backboard Differencing communication by the voltage signal, current signal and power circuit
The work state information of measuring system is sent to the master control borad；The master control borad obtains sentencing for high voltage direct current equipment protection system
According to numerical value；The master control borad judges it with the presence or absence of failure, if described according to the working condition of the power circuit measuring system
There are failures for power circuit measuring system, the work state information of the power circuit measuring system then will be sent to the height
Straightening stream equips protection system, and according to the work state information, makes corresponding response；If power circuit measurement system
Failure is not present in system, then the master control borad is compared with the voltage signal and current signal respectively according to the criterion numerical value,
Judge high voltage direct current equipment with the presence or absence of failure；If there are failures for high voltage direct current equipment, by its fault message and Current Voltage
Value is uploaded to the high voltage direct current equipment control protection system.
The master control borad includes processor, Acquisition Circuit and level shifting circuit；The Acquisition Circuit is from the power line
The voltage signal and current signal on transmission line of electricity are obtained in the measuring system of road；The level shifting circuit is by collected signal
It is compared with preset signals range, when collected signal exceeds preset signals range, issues comparison result signal；It is described
Processor judges the fault type of high voltage direct current equipment according to the comparison result signal, and carries out fault message passing through optical fiber
It is uploaded to the high voltage direct current equipment control protection system.
The Acquisition Circuit includes that filtering conditioning circuit, serial analog-digital converter, hardware over-current detection circuit and digital-to-analogue turn
Parallel operation；After collected signal analog passes through the filtering conditioning circuit, signal is converted to through the serial analog-digital converter
Digital quantity is transmitted to the processor；
Collected signal analog is protected with the overcurrent generated by the digital analog converter and hardware over-current detection circuit
Shield value is compared, and hardware over current fault signal is effective after detecting hardware overcurrent.
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, it is made of in the quick fault testing device of technical solution of the present invention optic current transformer and its combining unit
Measuring device can accurately carry out signal measurement under the forceful electric power magnetic environment of Current Voltage high speed transient；
2, the quick fault testing device of technical solution of the present invention can be realized in tens microseconds to the accurate of fault current
Acquisition and signal processing, to meet failure response minimum time requirement；
3, after the fault detection means of technical solution of the present invention parses the electric current, the voltage signal that receive, direct current is exported
System failure signal, fault-signal are exported using optical signal, the tripping for protective device；
4, the fault detection algorithm of technical solution of the present invention can be quickly and accurately to over current fault, over-voltage fault, electric current
Change rate failure, voltage change ratio failure are judged, and are responded.
Detailed description of the invention
Fig. 1 is the quick fault testing systematic schematic diagram of the embodiment of the present invention；
Fig. 2 is the quick fault testing systematic master control board structural schematic diagram of the embodiment of the present invention；
Fig. 3 is the sample circuit block diagram of the embodiment of the present invention；
Fig. 4 is the connection schematic diagram of the fault detection system of the embodiment of the present invention；
Fig. 5 is that the fault detection system of the embodiment of the present invention forms figure.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
The invention of this example provides a kind of high voltage direct current equipment quick fault testing method and detection system, the method packet
It includes:
(1) voltage and current signals on transmission route survey systematic survey route, by current changing rate, voltage change
Whether rate, current over-zero, current amplitude, voltage magnitude signal and measuring system working condition be transferred to control cabinet；
(2) control cabinet receives the criterion numerical value that high voltage direct current equipment protection system is sent, while receiving measuring system hair
Voltage, the current measurement signal sent；
(3) if there are failures for measuring system, cabinet is controlled by status information and is sent to high voltage direct current equipment protection system,
Make corresponding response；
(4) control cabinet compares received criterion and the signal received, judges whether faulty presence；
(5) fault message and physical quantity are uploaded to high voltage direct current equipment control protection system by control cabinet.
High voltage direct current equipment failure detection system and Control protection system and measuring system connection schematic diagram as shown in Figure 1,
Tested voltage, current signal on DC bus need to be transferred to control cabinet after measuring system is converted, and control cabinet
Measuring signal and fault-signal are sent to high voltage direct current equipment control protective device by fiber optic communication, it is high if faulty
Straightening stream equips quick response, to have the function that protect circuit.
High voltage direct current equipment failure detection system master control borad hardware block diagram is as shown in Figure 2.
Processor completes magnitude of current synchronous acquisition, prejudges algorithm by current filtering, pre- whether to determine high voltage direct current equipment
Overcurrent, and the information such as electric current are uploaded to control system by optical fiber.Processor extension Ethernet network interface facilitates in debugging process
Observe main branch electric current, transfer branch current, capacitance voltage and simulated failure.
Fault detection system acquires the signal of tested high voltage direct current equipment by sample circuit, and level shifting circuit will acquire
To signal be compared with preset signals range, when collected signal exceed preset signals range when, issue comparison result
Signal, processor judge the fault type of high voltage direct current equipment according to comparison result signal, and carry out troubleshooting.
Analog acquisition circuit block diagram is as shown in figure 3, the Acquisition Circuit has the identical acquisition access in four tunnels.
Acquisition access mainly uses two accesses:
(1) analog acquisition
After analog quantity is filtered by conditioning circuit, digital quantity is converted to by high speed serialization ADC and is transmitted to processor.
(2) hardware overcurrent protection
Analog quantity is compared by the overcurrent protection value that hardware over-current detection circuit and DA are generated, after detecting hardware overcurrent
Hardware over current fault signal is effective.
Fault detection system and Control protection system use optical-fibre communications.
High voltage direct current equips connection block diagram such as Fig. 4 institute with high voltage direct current equipment protection system of quick fault testing system
Show, rapid detection system receives the information of voltage/current combining unit simultaneously, and effective voltage letter is extracted from received data
Breath is with current information and by information package, and possible failure message is analyzed in result data processing, and then fault message passes through 2 tunnels
Optical fiber, output equip protection system to high voltage direct current.
Rapid detection system is the combining unit voltage/current information received, while passing through 2 road fast fibre channels will
Information is transmitted to high voltage direct current equipment protection system.
Fault detection system is made of power panel, communication board and master control borad, and fault detection system composition figure is as shown in Figure 5.
Wherein communication board receives the measurement data of measuring system, and measurement data is then sent to master control borad by backboard Differencing communication,
Master control borad receives the threshold value of high voltage direct current equipment protection system, measurement data and threshold value is compared analysis, by comparison result
And measurement data is sent to high voltage direct current by optical fiber sending port and equips protection system.
Wherein, judge whether that faulty existing process includes:
(1) overcurrent judges
Fault detection means is by the current information i on real-time monitoring wire, and receives high voltage direct current and equip protection system
Threshold value IM be compared, relatively before current information i is handled as unsigned number.
If: i >=IM, then
Fault flag OVER_CURRENT=' 1 '
If: i < IM, then
Fault flag OVER_CURRENT=' 0 '
In practice, since current information i itself is there are a deviation delta (positively biased or negative bias), this results in comparing in overcurrent
In, overcurrent flag bit will appear jitter phenomenon, therefore use the processing method of interval threshold, as follows:
If: i >=IM, then
Fault flag OVER_CURRENT=' 1 '
If: i < (IM-Δi), then
Fault flag OVER_CURRENT=' 0 '
Wherein, Δi> Δ (ensures that judging result is accurate).
(2) over-voltage judges
Fault detection means is by the information of voltage v on real-time monitoring wire, and receives high voltage direct current and equip protection system
Threshold value VM be compared, relatively before information of voltage v is handled as unsigned number.
If: v >=VM, then
Fault flag OVER_VOLTAGE=' 1 '
If: v < (VM-Δv), then
Fault flag OVER_VOLTAGE=' 0 '
Wherein, Δv> voltage sample deviation (ensures that judging result is accurate).
(3) current changing rate breakdown judge
The current changing rate information di/dt that fault detection means real-time reception measuring system is sent, and receive high voltage direct current
Equip the change rate threshold value di of protection systemMIt is compared.
If: di/dt >=diM, then
Fault flag FAULT_CURRENT_RATE=' 1 '
If: di/dt < (diM-Δi-rate), then
Fault flag FAULT_CURRENT_RATE=' 0 '
Wherein, Δi-rate> current changing rate sampling deviation (ensures that judging result is accurate).
(4) voltage change ratio breakdown judge
The voltage change ratio information du/dt of fault detection means real-time reception measuring system, and receive high voltage direct current equipment
The change rate threshold value du of protection systemMIt is compared.
If: du/dt >=duM, then
Fault flag FAULT_VOLTAGE_RATE=' 1 '
If: du/dt < (duM-Δu-rate), then
Fault flag FAULT_VOLTAGE_RATE=' 0 '
Wherein, Δu-rate> voltage change ratio sampling deviation (ensures that judging result is accurate).
Positioning is quick, testing result is accurate, and it is intuitive, clear to prompt, and is not susceptible to judge by accident, and meet field test requirement.
The transmission route survey system includes voltage transformer and current transformer；The failure of the measuring system is also
Judged by the above method.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention
It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen
Within claims of the invention that please be pending.
Claims (7)
1. a kind of high voltage direct current equipment quick fault testing method, it is characterised in that: include:
Voltage signal on transmission line of electricity, current signal and power circuit measuring system are obtained by power circuit measuring system
Work state information；
Obtain the criterion numerical value of high voltage direct current equipment control protection system；
It is judged with the presence or absence of failure, if the power line drive test according to the work state information of the power circuit measuring system
There are failures for amount system, then the work state information of the power circuit measuring system are sent to the high voltage direct current equipment control
Protection system processed, and according to the work state information, make corresponding response；
If the power circuit measuring system be not present failure, according to the criterion numerical value respectively with the voltage signal and electricity
Stream signal compares, and judges high voltage direct current equipment with the presence or absence of failure；
If there are failures for high voltage direct current equipment, its fault message and Current Voltage value are uploaded to the high voltage direct current equipment control
Protection system processed；
The power circuit measuring system determines current changing rate, voltage according to the current signal and voltage signal that measure
Whether change rate, current over-zero, the signal of current amplitude and voltage magnitude；
The breakdown judge of the high voltage direct current equipment includes overcurrent judgement, over-voltage judgement, current changing rate breakdown judge and voltage
Change rate breakdown judge；
The overcurrent deterministic process are as follows:
Current information i on monitoring transmission line of electricity in real time, and the threshold value I with high voltage direct current equipment control protection systemMIt carries out
Compare, it is relatively more preceding to handle the current information i for unsigned number；
Since the current information i itself is there are a current sample deviation delta, cause overcurrent relatively in, overcurrent flag bit meeting
There is jitter phenomenon, therefore the facture of interval threshold used to carry out overcurrent comparison:
If i >=IM, then over current fault flag bit is 1, indicates overcurrent fault；
If i < (IM-Δi), then over current fault flag bit is 0, is expressed as non-overcurrent fault；
Wherein, Δi> Δ.
2. a kind of high voltage direct current equipment quick fault testing method as described in claim 1, it is characterised in that:
The over-voltage deterministic process are as follows:
Information of voltage v on monitoring transmission line of electricity in real time, and the threshold value V with high voltage direct current equipment control protection systemMIt carries out
Compare, it is relatively more preceding to handle information of voltage v for unsigned number；
If: v >=VM, then over-voltage mark failure will position is 1, indicates overvoltage failure；
If: v < (VM-Δv), then over-voltage fault flag bit is 0, indicates non-excessive voltage failure；Wherein, Δv> voltage sample is inclined
Difference.
3. a kind of high voltage direct current equipment quick fault testing method as described in claim 1, it is characterised in that:
The current changing rate breakdown judge process are as follows:
The current changing rate information di/dt that the power circuit measuring system measures is obtained in real time, and is equipped with high voltage direct current
The change rate threshold value di of Control protection systemMIt is compared；
If di/dt >=diM, then current changing rate fault flag is 1, indicates current changing rate failure；
If di/dt < (diM-Δi-rate), then current changing rate fault flag is 0, indicates non-current changing rate failure；
Wherein, Δi-rate> current changing rate sampling deviation.
4. a kind of high voltage direct current equipment quick fault testing method as described in claim 1, it is characterised in that:
The voltage change ratio breakdown judge process are as follows:
The voltage change ratio information du/dt that the power circuit measuring system measures is obtained in real time, and is equipped with high voltage direct current
The change rate threshold value du of protection systemMIt is compared；
If du/dt >=duM, then voltage change ratio fault flag is 1, indicates voltage change ratio failure；
If du/dt < (duM-Δu-rate), then voltage change ratio fault flag is 0, indicates non-voltage change ratio failure；
Wherein, Δu-rate> voltage change ratio sampling deviation.
5. a kind of fault detection system for high voltage direct current equipment quick fault testing method described in claim 1,
It is characterized in that: including controlling cabinet；The control cabinet includes power panel, communication board and master control borad；The communication board passes through electricity
The working condition letter of voltage signal, current signal on power route survey system acquisition transmission line of electricity and power circuit measuring system
Breath；The work state information of the voltage signal, current signal and power circuit measuring system is sent out by backboard Differencing communication
It send to the master control borad；The master control borad obtains the criterion numerical value of high voltage direct current equipment protection system；The master control borad is according to institute
The work state information for stating power circuit measuring system judges it with the presence or absence of failure, if the power circuit measuring system exists
The work state information of the power circuit measuring system is then sent to the high voltage direct current and equips protection system by failure, and
According to the work state information, corresponding response is made；If failure, the master is not present in the power circuit measuring system
Control plate is compared with the voltage signal and current signal respectively according to the criterion numerical value, judges whether high voltage direct current equipment is deposited
In failure；If there are failures for high voltage direct current equipment, its fault message and Current Voltage value are uploaded to the high voltage direct current and filled
Standby Control protection system.
6. a kind of high voltage direct current equipment quick fault testing system as claimed in claim 5, it is characterised in that: the master control
Plate includes processor, Acquisition Circuit and level shifting circuit；The Acquisition Circuit is obtained from the power circuit measuring system
Voltage signal and current signal on transmission line of electricity；The level shifting circuit by collected signal and preset signals range into
Row compares, and when collected signal exceeds preset signals range, issues comparison result signal；The processor is according to the ratio
Compared with the fault type that consequential signal judges high voltage direct current equipment, and carry out fault message being uploaded to the high straightening by optical fiber
It flows equipment control and protects system.
7. a kind of high voltage direct current equipment quick fault testing system as claimed in claim 6, it is characterised in that: the acquisition
Circuit includes filtering conditioning circuit, serial analog-digital converter, hardware over-current detection circuit and digital analog converter；Collected signal
After analog quantity passes through the filtering conditioning circuit, signal digital quantity is converted to through the serial analog-digital converter and is transmitted to the processing
Device；
Collected signal analog and the overcurrent protection value generated by the digital analog converter and hardware over-current detection circuit
It is compared, hardware over current fault signal is effective after detecting hardware overcurrent.
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| CN109031034A (en) * | 2017-06-09 | 2018-12-18 | 许继集团有限公司 | A kind of circuitry fault detection method and system |
| CN107478950A (en) * | 2017-07-28 | 2017-12-15 | 许继集团有限公司 | A kind of discrimination method of the bipolar short trouble of DC line |
| CN110365102B (en) * | 2018-03-26 | 2022-07-05 | 全球能源互联网研究院有限公司 | Monitoring system and monitoring method for high-voltage direct-current circuit breaker |
| US10938314B2 (en) * | 2018-07-23 | 2021-03-02 | Smart Wires Inc. | Early detection of faults in power transmission lines |
| CN112039156B (en) * | 2020-08-31 | 2022-02-18 | 广州极飞科技股份有限公司 | Overcurrent protection method and device and operating equipment |
| CN113542085B (en) * | 2021-06-28 | 2022-08-02 | 浙江富特科技股份有限公司 | Method for rapid fault protection diagnosis of vehicle-mounted power supply |
| CN113937736B (en) * | 2021-10-15 | 2023-12-19 | 劲逐软件技术(深圳)有限公司 | Power system fault protection system and protection method |
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